*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --bg: #f4efe6;
  --surface: #fffdf8;
  --ink: #1f1a14;
  --muted: #6b6258;
  --accent: #c45c26;
  --accent-soft: #f3dccf;
  --border: #e2d6c8;
  --shadow: 0 18px 40px rgba(31, 26, 20, 0.08);
  --radius: 18px;
  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --font-sans: "Avenir Next", "Segoe UI", system-ui, sans-serif;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--ink);
  background:
    radial-gradient(circle at top left, #fff7ea 0%, transparent 45%),
    radial-gradient(circle at bottom right, #eadfce 0%, transparent 40%),
    var(--bg);
  line-height: 1.6;
}

.app {
  width: min(680px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 3rem 0 4rem;
}

.header {
  text-align: center;
  margin-bottom: 2rem;
}

.eyebrow {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}

.header h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.1;
  color: rgba(107, 98, 88, 1);
}

.subtitle {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
}

.card-label {
  margin: 0 0 1rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.idiom {
  margin: 0 0 1.75rem;
  padding: 0;
  border: none;
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  line-height: 1.25;
  color: var(--ink);
}

.idiom::before {
  content: "\201C";
  color: var(--accent);
}

.idiom::after {
  content: "\201D";
  color: var(--accent);
}

.reveal-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.detail-block {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition:
    grid-template-rows 0.45s ease,
    opacity 0.35s ease,
    margin-top 0.45s ease;
}

.detail-block.is-revealed {
  grid-template-rows: 1fr;
  opacity: 1;
  margin-top: 1.25rem;
}

.detail-block.is-revealed + .detail-block.is-revealed {
  margin-top: 0;
}

.detail-inner {
  overflow: hidden;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

.detail-block h2 {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
}

.meaning,
.example,
.origin {
  margin: 0;
  font-size: 1.05rem;
}

.example {
  color: var(--muted);
  font-style: italic;
}

.origin {
  color: var(--muted);
}

.card-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

.step-indicator {
  display: flex;
  gap: 0.5rem;
}

.step-dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--border);
  transition: background 0.25s ease, transform 0.25s ease;
}

.step-dot.is-active {
  background: var(--accent);
  transform: scale(1.15);
}

.step-dot.is-complete {
  background: var(--accent-soft);
  box-shadow: inset 0 0 0 2px var(--accent);
}

.reveal-prompt {
  margin: 0;
  text-align: center;
  font-size: 0.95rem;
  color: var(--muted);
}

.reveal-prompt.is-complete {
  color: var(--accent);
  font-weight: 600;
}

.actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.btn {
  appearance: none;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  font-weight: 600;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.btn-primary {
  padding: 0.9rem 1.6rem;
  background: var(--accent);
  color: #fff;
  box-shadow: 0 10px 24px rgba(196, 92, 38, 0.25);
}

.btn-primary:hover {
  transform: translateY(-1px);
  background: #b55220;
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:focus-visible {
  outline: 3px solid var(--accent-soft);
  outline-offset: 3px;
}

.btn-secondary {
  padding: 0.75rem 1.35rem;
  background: var(--surface);
  color: var(--accent);
  border: 1px solid var(--accent-soft);
  box-shadow: none;
}

.btn-secondary:hover {
  transform: translateY(-1px);
  background: var(--accent-soft);
}

.btn-secondary:active {
  transform: translateY(0);
}

.btn-secondary:focus-visible {
  outline: 3px solid var(--accent-soft);
  outline-offset: 3px;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn:disabled:hover {
  transform: none;
  background: var(--accent);
}

.btn-secondary:disabled:hover {
  background: var(--surface);
}

.counter {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

@keyframes revealIn {
  from {
    transform: translateY(8px);
  }
  to {
    transform: translateY(0);
  }
}

.detail-block.is-revealed .detail-inner {
  animation: revealIn 0.45s ease;
}

.card.is-changing {
  animation: fadeSwap 0.35s ease;
}

@keyframes fadeSwap {
  0% {
    opacity: 1;
    transform: translateY(0);
  }
  45% {
    opacity: 0.35;
    transform: translateY(6px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 520px) {
  .app {
    padding-top: 2rem;
  }

  .card {
    padding: 1.5rem;
  }
}